--[[
    Lua 5.1 Copyright (C) 1994-2006 Lua.org, PUC-Rio
]]

function sayHello()
    print("hello")
end

function sayHello2(name)
    print("hello " .. name)
end

function sayHello3(name1, name2) 
    print("hello " .. name2 .. " and " .. name2)
end

function sum(i, j)
    print("i=", i , " j=", j)
    return i + j, i, j  -- 返回多个值
end